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Lybich123
2 năm trước
Một tàu chở hàng khởi hành từ TP Hồ Chí Minh với vận tốc 36 km/h. Sau đó 2 giờ, một tàu chở khách cũng đi từ đó với vận tốc 48km/h đuổi theo tàu hàng. Hỏi tàu khách đi bao lâu thì gặp tàu hàng?
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